grails.gorm.flushMode should have COMMIT as default value in the documentation

[andersaaberg]

In the documentation (https://gorm.grails.org/latest/hibernate/manual/index.html#_configuration_reference), grails.gorm.flushMode has default value AUTO but default value for flushMode was changed to COMMIT in GORM 6.1: https://gorm.grails.org/6.1.0/hibernate/manual/index.html#_flush_mode_now_commit_by_default

The GORM code does have default flushMode set to COMMIT, so the documentation is wrong: https://github.com/grails/gorm-hibernate5/blob/7.2.x/grails-datastore-gorm-hibernate5/src/main/groovy/org/grails/orm/hibernate/AbstractHibernateDatastore.java#L132

[andersaaberg]

Candidate fix: https://github.com/grails/gorm-hibernate5/compare/7.2.x...andersaaberg:patch-1